Valve and method of making same



v WITNESS A. M. STEWART.

VALVE AND METHOD 0F MAKING SAME. Arrucmon man mv 5.1921.

Im wam-om 'P/Y( @WY Patented New. 7, i922.

ANDREW M. srnwan'r, or TOLEDO, omo.

'VALVE AND METHOD OF MAKING SAME.

Application filed May 5, 1921. Serial No. 466,921.

To all whom. 25' may concern Be it known that l, ANDREW M. STEWART, a citizen oi' the United States, residing at Toledo, in the lcounty of Lucas and State ot Ohio, have invented new and useful lmprovements in Valves and Methods of Making Same, of which the following is a speci- .tication.

My invention relates to valves, and more particularly toworking-barrel valves for oil wells, though it may be employed for other uses. Particularly in the valves used 'for pumping oil-wells, the valve-seats are subject to considerable wear and must be replaced from time to time. Valve-seats as usually made for oil-well pumps have an eX- ternal or peripheral flange made integral therewith and designed to be clamped between the valvebarrel and the crown or cage. Such seats are usually made from high grade alloy steel and after machiningare heat treated which causes such distortion thereof as necessitates the grinding of the external surface at each side of the ilange. The grinding is rendered somewhat difficult and slow because it is necessary to chuck the seat twice in the grinder and to give it two gaugings, which increase the possibility ot' errors and limits the quantity production. t is the object of this invention to make the iiange and the rest of the valve-seat in sepa-- rate parts, so that the grinding and gauging may be done but once and after a single chucking operation. After the grinding has been completed the flange is united with the remainder of the seat.

My invention relates also to the method ot making the valve seats.

Referring to the accompanying drawing, l is a side elevation of a pump-piston containing my improved valve-seat, the lower end or' the pump piston being broken ofi' Fig. 2, a central longitudinal section of Fig. l; Fig. 3, and side elevation of my valveseat without the flange; Fig. 4, a side elevation of my valve-seat showing the ilange being slipped to its annular seat; and Fig. 5, a side elevation of my valve seat as sembled.

On the drawing, l designates a pump-piston provided with one of its cup packings, marked 2. The piston has the axial opening 3 which has the enlargement 4l at its upper end. 5 designates the body of the valveseat which is cylindrical and has the central opening 6 in alnement with the opening 3 and the peripheral groove 7 centrally between the ends of the body. 8 is a metal ring or flange seated in the groove 7 and extending' beyond the. periphery oit the body l. One end of the body 5 is inserted in the enlargement -l ot the opening in t-he piston with the flange S resting on the top of the piston around the said ei'ilargement.l 9 is a ball-valve adapted to lit the flared ends of the opening 6. l0 is a crown or cage having the longitudinal opening ll enlarged below so as to form the shoulder l2 which engages the upper tace of the flange S when the cage is screwed down tight over the upper end ot' the piston. The cage has a number of late "al openings 13 extending entirelv through the side wall thereof and opening into the opening il. The upper end of the cage is closed and has the pin la for the attachment of a pump rod.

i'ter the body l has been ground and brought to the required diameter the rinej 3, whose internal diameter is smaller thanithe external diameter of the body is, after having been suitablyv heated to cause it to intil it comes exactly around the groove 'T into which it contracts upon cooling. Pr ssure may be applied. it necessary or desired, to seat the ring. The ring ma)v be forced cold over the bony l as shown in F this method taking advantage of the property of the metal to recover its normal condition aiter expansion under pressure. Then the ring reaches the groove 7 it will automatically spring into the same.

The ring S may bc made less expensive metal than the body 'l which is best made oi high grade alloy steel. .l ind that, after heat treatment has been completed, l can. by grinding the bodies in an automatic grinding machine, thus requiring but a singl@ grinding operation and fewer gagings, increase the production on the grinding and gaging operations alone as much as fifty times over the old process herein described.

My invention is not limited to its use in pistons as it may be used in standing valves, and other devices.

I claim:

l. In a valve, a valve-seat comprising a cylindrical body having a peripheral groove, and a ring seated in the groove. l y

2. n a valve, a valve-seat comprising a crasse its diameter, slipped over the body nncylindrical body having a peripheral groove, and a ring slid over the body and seated in the groove.

3. The method of making :L vulve-seat with cylindrical body and a central peripheral flange, which consists in forming a eylindrioal body with a peripheral groove therein, grinding` the periphery of the body to Jche desired gage, and forming a flange on the body by sliding, over lehe body and in registry with the groove an expanded oontractile ring Whose nornialexternal diemeter is less than the external diameter of the body.

Signed at Toledo, Ghio, this 3rd day of May, A.. D. 1921.

ANDREW M. STEWART. 

